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Spiral-type separation membrane element

A separation membrane and spiral technology, which is applied in the field of spiral separation membrane elements, can solve the problems such as the skin layer is easily damaged and the salt retention rate is reduced, so as to achieve excellent oxidant resistance, lower salt retention rate, and omission or simplification of pretreatment. Effect

Inactive Publication Date: 2016-09-14
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] As a separation membrane used for such a spiral separation membrane element, when the composite semipermeable membrane is used, since the composite semipermeable membrane is pressurized from the supply side flow path material side during water treatment, there is a skin layer. Susceptible to damage, problems with progressively lower salt rejection

Method used

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  • Spiral-type separation membrane element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] An amine solution was prepared by dissolving 3% by weight of N,N'-dimethyl-m-phenylenediamine, 0.15% by weight of sodium lauryl sulfate, 2.5% by weight of triethylamine, and 5% by weight of camphorsulfonic acid in ethylene glycol. . In addition, 0.2% by weight of trimesoyl chloride and 0.4% by weight of isophthaloyl chloride were dissolved in Exxsol D30 (manufactured by Exxon Mobil, distillation range 130 to 160°C, boiling point 148°C) to prepare an acid chloride solution. And, the amine solution covering layer is formed by applying the amine solution on the porous support and removing excess amine solution. Next, an acid chloride solution is applied to the surface of the amine solution coating layer. Afterwards, the excess solution was removed, and further kept in a hot air dryer at 100° C. for 5 minutes to form a skin layer containing a polyamide-based resin on the porous support, thereby producing a composite semipermeable membrane.

[0063] Using the detection uni...

Embodiment 2～7、 comparative example 1 and 2

[0066] Except using the composite semipermeable membrane produced in Example 1, and using the permeation-side channel material of the warp-knitted fabric having the porosity described in Table 1, the permeation flux and Salt rejection.

[0067] Reference example 1~3

[0068] A composite semipermeable membrane was produced in the same manner as in Example 1, except that 3% by weight of m-phenylenediamine was used instead of 3% by weight of N,N'-dimethyl-m-phenylenediamine in Example 1. In addition, the permeation flux and salt rejection were measured in the same manner as in Example 1, except that the prepared composite semipermeable membrane was used as the permeation-side channel material of the warp-knitted fabric having the porosity described in Table 1. Rate.

[0069] [Table 1]

[0070]

[0071] As can be seen from Table 1, the composite semipermeable membranes of Examples 1 to 7 prepared using N,N'-dimethyl-m-phenylenediamine as the polyfunctional amine component ha...

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Abstract

The objective of the present invention is to provide a spiral-type separation membrane element having superior oxidant resistance relative to the prior art, and a salt rejection rate that tends not to decrease. This spiral-type separation membrane element is characterized in including: a supply-side flow-path material; a composite semipermeable membrane in which a skin layer is formed on the surface of a porous support body, the skin layer containing a polyamide resin obtained by interfacial polymerization of a polyfunctional amine component and a polyfunctional acid halogen component; and a permeation-side flow-path material; the polyfunctional amine component containing N,N'-dimethyl meta-phenylenediamine; and the permeation-side flow-path material having a porosity of 40-75%.

Description

technical field [0001] The present invention relates to a spiral separation membrane element comprising a supply-side flow path material, a composite semipermeable membrane, and a permeation-side flow path material. Such a spiral separation membrane element is suitable for the production of ultrapure water, desalination of brine or seawater, etc., and can remove / recover the pollution sources contained therein from pollutants such as printing and dyeing wastewater, electrodeposition coating wastewater, etc. that are the cause of pollution, etc. Effective substances contribute to the recycling of waste water. In addition, it can be used for advanced treatments such as concentration of active ingredients in food applications, etc., and removal of harmful ingredients in water purification or sewage applications. In addition, it can be used for wastewater treatment in oil fields, shale gas fields, etc. Background technique [0002] Conventionally, as a composite semipermeable m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D63/10B01D63/00B01D69/12B01D71/56B32B5/18B32B5/24C08G69/26
CPCB01D71/56B32B5/026B32B27/34B32B2307/714B01D2313/146C08G69/28C08G69/32B01D69/02B01D63/10B01D67/0006B01D2325/30C09D177/10B01D69/1251B01D2325/0283B01D2323/081
Inventor 西山真哉中野顺子井上真一
Owner NITTO DENKO CORP
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